Over the last three months, Bureau of Land Management officials have found the bodies of 42 donkeys covered in gunshot wounds near the California-Nevada border. They were killed illegally in the Clark Mountain Herd Area.

“We will pursue every lead until we’ve arrested and prosecuted those responsible for these cruel, savage deaths, and we welcome the public’s help to bring the perpetrator or perpetrators to justice,” BLM deputy director for policy and programs William Perry Pendley said.

Under the Wild Free-Roaming Horses and Burros Act, burros are protected as “living symbols of the historic and pioneer spirit of the West.” As such, they can’t be killed, harassed, captured or branded in 10 Western states controlled by the Department of the Interior or the US Forest Service.

Details about the crimes are slim, but BLM officials told the Los Angeles Times a few of the burros were killed while drinking water from nearby springs. Many of them were juveniles.

BLM spokeswoman Sarah Webster didn’t have updates on the case Monday, but she said investigators haven’t identified any suspects yet.